Remove canberra from gnome-46?

[bandali]

(Per @seb128's suggestion I'm reporting this here in case we'd like to take an action about it.)

We recently received LP: #2077706 about some canberra log spam when launching the firefox snap:

[35309, Main Thread] WARNING: GTK+ module /snap/firefox/4757/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.: 'glib warning', file /build/firefox/parts/firefox/build/toolkit/xre/nsSigHandlers.cpp:187

(firefox:35309): Gtk-WARNING **: 10:24:56.255: GTK+ module /snap/firefox/4757/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 10:24:56.255: Failed to load module "canberra-gtk-module"
[35309, Main Thread] WARNING: GTK+ module /snap/firefox/4757/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.: 'glib warning', file /build/firefox/parts/firefox/build/toolkit/xre/nsSigHandlers.cpp:187

(firefox:35309): Gtk-WARNING **: 10:24:56.256: GTK+ module /snap/firefox/4757/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so cannot be loaded.
GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported.
Gtk-Message: 10:24:56.256: Failed to load module "canberra-gtk-module"

We may want to discuss/consider dropping canberra from the gnome-46 snap if there's little to no value/reason to keep it.